Theory Of The Earths Floor Spreading Question And Answers

A theory that states the earth s crust is broken into plates that float on the asthenosphere.

Theory of the earths floor spreading question and answers.

For instance the atlantic ocean is believed to be expanding because of its few trenches. 3 the mid ocean ridge is found throughout the oceans of the earth. Geologist harry hess finally proved that wegener was right. The earth s crust is one solid plate that is glued in place on top of the layers below.

Molten rock pushes up from the asthenosphere and pushes the plates apart at the mid ocean ridge. The ocean floor has remained essentially unchanged since the formation of the earth. Subduction theory supposes that converging plates are destroyed below ocean trenches. Sea floor spreading answer key.

It is an underwater mountain range that forms when magma pushes up on the crust at a divergent boundary. This is a mid ocean ridge. Questions and answers 1. This creates new ocean crust.

The lithosphere is made up of. The theory of seafloor spreading explains that earth s continents move because they ride atop ocean crust as it moves way from ocean ridges. The continents are moving apart. Hess believed that sea floor spreading is the answer to the mystery of continental drift.

Is the idea that the continents are slowly drifting further away from each other. Corollary to the idea of plate accretion by sea floor spreading is the notion of plate destruction by subduction. Seafloor spreading is happening at b. A combination of the seafloor spreading theory and the continental drift theory.

Due to this continuous seafloor spreading occurs and makes atlantic ocean floor to be connected to other continental crust making the ocean gets wider over the time. 2 in the 1960 s scientists finally found what was missing in wegener s theory. If sea floor spreading occurs without plate destruction the quantity of crust will increase and the volume of the earth must increase. Subduction and sea floor spreading are processes that could alter the size and form of the ocean.

What is the mechanism for sea floor spreading that heralded the advent of full blown plate tectonic theory. Centrifugal force from the spinning earth mantle convection cells the pull of the sun and the moon and associated gravitational forces the earth s magnetic field ocean currents dragging along the seafloor.